Communicate information about background jobs
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French Toast

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Communicate information about background jobs in Rails seamlessly.

FrenchToast attempts to streamline some progressive enhancement by providing a simple and opinionated interface. In order to best take advantage of this, it is important to render that information on the backend. This allows FrenchToast to figure out the best possible communication stream, by starting the most basic functionality and slowly building up to more enhanced features.

With FrenchToast it will:

  1. Communicate through websockets
  2. If that is unavailable, communicate on next page refresh
  3. If the user hasn't seen the content, send them an email


  • Add the FrenchToast gem to your Gemfile:

    gem "french_toast"
  • Run bundle install from your shell.

  • Generate migrations so FrenchToast can render information when javascript isn't available.

rails generate french_toast:install
rake db:migrate



The #french_toast helper provides the simplest interface for FrenchToast. It can be used, for example, on the application layout.

# application.html.erb
<%= french_toast %>

FrenchToast looks for templates by default in the views/french_toast folder.

# _foo.html.erb
<div>You'll see me eventually! <%= your_name %></div>

Use #notify with the name of the template to be rendered to render that template on the page.

# something_job.rb
class SomethingJob
  def perform
    FrenchToast.notify("foo", locals: { your_name: "Jim-bob" })

Where you specified #french_toast you will see the foo.html.erb template fully rendered using the best channel available to your user.

Specifying sections

FrenchToast gives you the option to be more specific about what kind of content should be rendered.

Provide a namespace to #french_toast helper

# posts/index.html.erb
<%= french_toast :post %>

Referencing a template the same way, provide name attribute to #notify will render the template only where it is namespaced.

#... something_job.rb
def perform
  FrenchToast.notify("foo", name: :post)

Where #french_toast was specified with :post, the foo.html.erb template will be rendered.

Synchronous render control

FrenchToast by default will store information in your database to be displayed later if a user is unable to receive information asynchronously. This can be prevented if there is already a faster, simpler way to communicate information on page load.

For example, FrenchToast is being used to update a list of posts on a page through websockets, but there is already a code to render each post on the server. You can prevent FrenchToast from storing that content on the server.

On the #french_toast helper you can specify the synchronous attribute, which helps specify the type of communication allowed.

<%= french_toast :post, synchronous: false %>

Granular template control

FrenchToast by default assumes HTML templates are being rendered on the page. There are times that require more granular control of the template because the information being sent is not HTML.

A custom template can be specified and referenced using the template attribute on the #french_toast helper.

<%= french_toast :text, template: "text_only" %>

Create a template in french_toast/templates and use the #french_toast_tag helper to generate the necessary HTML that can be identified by FrenchToast.

# _text_only.html.erb
<div class="my-own-thing" >
  <%= french_toast_tag :p %>


See the CONTRIBUTING document. Thank you, contributors!


French Toast is Copyright (c) 2016-2017 thoughtbot, inc. It is free software, and may be redistributed under the terms specified in the LICENSE file.


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